Refrigerating apparatus.



E. P. CONNELLY.

REFRIGERATING APPARATUS.

APPLICATION flLED MAR. Hi. 915.

1,233,755. Patnted July 17, 1911.

2 SHEETS-SHEET I.

Attorney! E. P. CONNELLY.

REFRIGERATING APPARAIUS. APPLICATION FILED mm. I6. 1916. Patented July17, 1917- 2 SHEETS-SHEET 2.

1N VEN T 01? EUGENE P. CONNELLY, 015 BOSTON, MASSACHUSETTS.

BEFRIGERATING- APPARATUS.

Specification of Letters Patent.

Patented July 1'7, 1917.

Application filed March 16, 1916. Serial No. 84,687.

To all whom it may concern:

Be it known that I, EUGENE P. -CONNELLY, a citizen of the United States,and resident of Boston, in the county of Suffolk and State ofMassachusetts, have invented certain new and useful Improvements inRefrigerating Apparatus; and do hereby declare the following to be a.full, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to improvements in refrigerating systems, andmore particularly to such as that disclosed in application filed by meon the 23rd day of January 1915, and designated by. Serial No. 3939,oneobject of: the present invention being to provide simple and efficientelectrically controlled means for electrically controlling the operationof therefrigerating system under varyin conditions which may arise.

ith this and other objects in view, the invention-consists in certainnovel features of construction and combinations of parts as hereinafterset forth and pointed out in the claims.

In the accompanying drawings; Figure 1 is a diagrammatical view of arefrigerating apparatus showing an embodiment of my invention; and Fig.2 is a separate view showing the controlling appliances for the brinecirculating means.

In the refrigerating apparatus per se represented in the drawing, 1represents a gas J compressor, the piston of which may be reciprocatedby the operation of an electric motor 2, having its rotary memberconnected with the rod 3 of said piston through the medium of a crankshaft 1, or any other suitable means may be employed to transmit motionfrom the motor to the piston of the gas compressor. The cylinder of thecompressor will preferably be provided with a cooling jacket 5, throu hwhich water may be circulated, as hereinater explained.

The gas compressor is provided at one end with a valved outlet 6 and avalved inlet 7. A pipe 8 communicates with the valved outlet and leadsto one end of a condensing coil 9. This coil may be inclosed within apipe 10 through which water may be circulated for effecting condensationof the ammonia gas flowing through the coil 9. In the con structionshown in the drawing, water is supplied to the cooling coil 10 by a pipe11.

This pipe communicates with the casing 12 of a balanced valve and thelatter is connected-by a pipe 13 with a main water pipe 14 which mayreceive water from a city or other water supply under suitable pressure,such as city pressure. A valve 15 may be located in the pipe 11 betweenthe balanced valve 12 and the cooling coil 10. Water will bedischargedfrom the lower end 16 of the cooling coil and may be conveyed away inany suitable manner. Water for the cooling jacket 5 of the compressormay be conveyed to said jacket by means of a pipe 17 connected with thepipe 11.

A pipe 18 conducts liquefied ammonia from the condensing coil 9 to thetop of a water-cooled storage cylinder 19, a valve 20 being located inthe pipe 18 between the coil 9 and the cylinder 19 to prevent back flowof liquid to the condensing coil. A pipe 21 communicates with the upperportion of the cylinder 19 and is provided with an expansion valve 22,the stem of which is connected with a diaphragm inclosed within a casing23 mounted on the casing of said expansion valve for a purposehereinafter explained. The pipe 21 is connected with one end of afreezing or refrigerating coil 24: while the opposite end of the latteris connected by a pipe 25 to a receiver 26, said "pipe being providedwith a releasing valve 27L The stem of this valve is connected withdiaphragm 27* in a chamber 27 of the casing of valve 27, so that whenpressure is introduced under said diaphragm, the valve will be openedand release all gas in the expansion or cooling coil. The receiver 26 isof size sufiicient to take care of all the gas during a reasonableperiod of time. With the relief valve set to release at that pressure incoils 24 which will give the best cooling effect, a uniform pressure andtemperature will be maintained in the coils. in coils escapes into thereceiver, the pressure in the latter will rise-and if the receiver be ofsuflicient size to accommodate all the gas stored in cylinder 19, it isapparent that the pressure in the receiver would never equal thepressure in the coils. It is not however necessary or desirable to use areceiver to accommodate all the gas, but one of size suiiicient tomaintain the proper temperature for a reasonable length of time. As theexcess of pressure is released, the pressure in the receiver willcontinue to in- As the excess pressure crease until it equals that inthe coils. Up to this period a uniform tem mrature and pressure will bemaintained in the coils, but as the liquefied gas still continues to bedischarged from cylinder 19, it is apparent that the pressure in thecoils and also the receiver will continue to rise but owing to theincreasing pressure a uniform temperature would not be maintained. Theobject of the receiver is to maintain a uniform pressure and temperaturefor a longer period than would otherwise be possible.

Leading from the receiver 26 to the inlet valve 7 of the compressor 1,is a pipe 28,

proiided with a valve 29. The casing of this valve is provided with anenlarged portion 30 in the chamber of which a diaphragm 31 is locatedand connected with the stem of the valve 'for a purpose hereinafterexplained. A valved pipe 32 communicates with the pipe 28 for chargingthe system with ammonia gas from any convenient source of supply.

A pipe 33 communicates at one end with the main Water supply pipe 14,and a valve 34 may be located in the latter between the connections ofthe pipes 13 and 33 therewith. The pipe 33 leads to a compressioncylinder 35 and is provided with a valve 36 having a chamber 37 formedon i'ts casing to receive a diaphragm 38 connected with the stem of said-valve for a purpose which will be herein'afterexplainedl Thecompression cylinder 35 is also provided with an outlet controlled by arelief valve as indicated at 39.

This compression cylinder is located in line with the storage cylinder19 and contains a piston 40 which is connected by a rod 41 with thepiston 42 in the storage cylinder.

- The compression cylinder is provided with a temporary cover 43 to keepout dirt or-dust, and a cross bar 43 is secured across the top of thecylinder 35 having a hole for the passage of the rod 41 and serve as aguide for,

the latter.

In the operation ofthe apparatus as thus:

far described, ammoniagas is forced by the compressor 1 into condensercoil 9 where it is liquefied and passes from thence, in liquid form,into storage cylinder 19. After the cylinder 19 has been filled with theliquefied gas at high pressure, 'the gas is still further compressed byadmitting fluid to the underside of piston 40. The ,pressure againstpiston 40 is always sufiicient to maintain the liquid in cylinder 19undercompression and .prevent any expansion of the latter and alsoprevents passage of ammonia vapor to the refrigerating coil. After the,proper pressure of the liquefied gas in the cylinder 19 has beenattained, the expansion valve 22 will be opened, thus permitting theliquid in cylinder 19 to gradually escape into the refrigerating coil,where it is vaporized and by its rapid expansion produces a lowtemperature in the coil in the well known manner. The liquid escapesslowly from the cylinder 19, but as the pressure exerted on piston 40 isalways in excess of the pressure exerted on piston 42, the latter isgradually forced upwardly which offsets any expansion of the liquefiedgas in the storage cylinder 19, and the initial pressure is maintainedthroughout the operation of the apparatus irrespective of volume. As theliquefied gas leaves the expansion valve 2.3 and enters the coil 24 itis rapidly vaporized and expands and spreads out through the .enil.

The cylinder 19 's of suflicient capacity to supply gas to the coil fora certain length of time, which of course can be increased or decreasedby varying the size of the cylinder. After the apparatus has exhausteditself, or in other words, after all the liquid in cylinder 19 has'assed into the refrigerating coil 24, the fluid may be exhausted fromcylinder 35 and the compressor 1 started. It may be here stated that thefluid may be released from cylinder 35 through the valve 39 by theaction of pressure on top of piston 42 forcing the iston 4O downwardly,thus compressing fluid in cylinder 35 and any increase in pressure offluid in cylinder '35 in excess of that at which the relief valve 39 isset, will bereleased. The 0 era'tion of the compressor 1 sucks orwithdraws the gas from the receiver 26 through pipe 28 into thecompressor 1 and from thence forces it through condenser 9 and into .thestorage cylinder 19 in liquid form under pressure, and fluid pressure inthe cylinder 35 will be restored,

In order that the operations of the apparatus as above described, shallbe automatically controlled, the instrumentajlities now to be explainedare employed.

A lever 4.4 is pivotally supported between its ends, as indicated at 45and with the heavier arm 46 of this lever, a dependin r rod 47 isconnected. This rod is conneetet with two balanced valves 4849'locatedin valve casings 12 and 50 respective'ly,the valve 48 beingadapted to control the -flow of water from the main supply pipe 14through the pipe 11 to the cooling pipe 10 of the ammonia condenser, andthrough the pipe 17 'to the water jacket 5 of the compressor 1. A pipe51 connects the main water supply pipe 14 with the casing 50 of balancedvalve 49 and said casing is also provided with an exhaust pipe 52. Awater pipe 53 also communicates, at one ,end with the casing 50 ofbalanced valve 49, and extends to the casing 53 of another balancedvalve 54. This last-mentioned valve casing is provided .with an exhaustoutlet 55 and -.a pipe 556 communicates at one .end with said valvecasing 53 and with the casing of the expansion valve 22 over thediaphragm therein, so that when fluid pressure 18 permitted to flowthrough the pipe 56 to the chamber 23 of valve 22, said valve will beclosed.

A pipe 57 communicates at one end with the water pipe 53 and at theother end with the chamber 30 on the casing of valve 29 so as todischarge-fluid pressure under the iaphragm and thus operate to' openthe valve 29.

A pipe 58 connects the water pipe 53 with the chamber 37 onthe casing ofvalve 36, so as to discharge fluidpressure to said chamber over thediaphragm 38 therein and operate to close said valve 36.

A pipe 58 connects the water-pipe 53 with the chamber 27 of the casingofvalve 27 so as to discharge under the valve therein, and this pipecontains a stop valve 58".

The heavier arm 46 ofthe lever 44 is provided with a spring-pressedlatch arm 59, which is normally engaged by the armature lever 60 of anelectro-magnet 61. One terminal of the magnet 61 15 connected by a wire62 with one pole of a battery 63, while the other terminal of saidmagnet is connected by a wire 64 with a contact 65 (which may indicate40 lbs.) on a high pressure gage 66, the latter being connected with thereceiver 26 in any suitable manner, so that its indicator finger 67 willbe actuated by pressure in saidreceiver. A wire 68 connects the battery63 with the gage 66 in such manner as to be electrically connected withthe indicator finger 67.' The gage 66 is also providedwith a contact"69, (which may indicate zero), andthis contact is connected by a wire70, with one terminal of the coil of a solenoid 71,-the other terminalof said coil being connected with the coil of another solenoid 72, andthe other terminal of the latter is connected by wires 7374 with thewire 62 leading to the battery 63. Thus it will be apparent that whenthe finger'67 of gage 66 engages the contact 65, a circuit will beclosed including the magnet 61 and battery 63, and that when said finger67 engages the contact 69 on the gage 66, a circuit will beclosed'including said battery and the coils of the solenoids 71-72. Thecores of these solenoids are connected with a cross bar 75 secured tothe arm 46 of the lever 44, so that when the solenoids are energized,the lever 44 will be operated to raise the balanced valves 48--49. Whenthe magnet 61 is energized, it will operate its armature lever 60 torelease the latch arm 59 and thus permit the heavier end of the lever 44to descend and operate the balance valves. The arm 46 of lever 44carries plungers 76-7 6 electrically as well as mechanically connectedto a cross bar 77, and disposed to enter mercury cups 78-7 8. Thesemercury circuit closers are included in circuit with the driving motor 2of the gas compressor, as follows :In the drawing I have shown twoleading-in wires 79-80 which may be connected with any suitable sourceof electrical supply. The leading-in wire 79 is connected, by aconductor 81 with one terminal of the motor 2, while the other terminalof the motor is connected by a conductor 82 with one of the mercury cupswhile the other-mercury cup is connected by a conductor 83 with theleading-in-wire 80. Thus it is apparent that when the arm 56 of lever 44descends, the motor circuit will be closed by the mercury circuitclosers and the motor will therefore be started.

In order to guard against possibility of failure of the arm 46 of lever44 todescend promptly when released, I provide a solenoid 84, the coreof which is connected with said arm 46, and the coil of this solenoid isincluded in a normally open circuit with a battery 85 and contacts 86,adapted to be bridged by a head 87 carried by the armature lever 60.Thus it will be seen that when the armature lever 60 is actuated (by themagnet 61) to release the lever 44, the head 67 carried by said armaturelever will bridge the contacts 86 and thus close the circuit of solenoid84, so as to cause said solenoid to positively pull the arm 46 of lever44 downwardly, and thus'insure the roper operation of the circuitclosers 6-78 and the valves 48-49.

A high pressure gage 88, is connected in any suitable manner with thehigh pressure side of the system, preferably between the condenser 9 andthe cylinder 19 and is provided with a contact 89 which may bedesignated 200. The indicator hand 90 of this gage is electricallyconnected, through the medium of a wire 91 with one pole of a but tery92. The other pole of this battery is connected, by conductors 93-73with the coil of the solenoids 72, while the coil of the solenoid 71 isconnected by conductors 7 0-94 with the contact 89 of the high pressuregage 88. A bell or other electrically operated indicator or alarm 95 maybe included in this circuit. It is apparent that when the pressure onthe gage 88 is such as to cause the hand 90 to engage the contact 89,the circuit of battery 92 will be closed, thus sounding the alarm 95 andenergizing the solenoids 7172 to tilt the lever 4-1 and effect theopen-circuiting of the motor circuit to stop the motor and also raisethe valves 4849 to close the same.

A dial thermometer 96 is located near the refrigerating coil 24 andprovided with contacts 97-98, which may be designated respectively toindicate certain predetermined degrees of temperature, say 30 and 36.The hand of the thermometer is indicated at 99. The contact 97'isconnected, by a conductor 100 with one terminal of an electro-magnet 101and the other terminal of this magnet is connected 'by a conductor 102with one pole of a battery 103, while the other pole of this battery isconnected by a-conductor 104 with the hand 99 of the thermometer.Themagnet 101 controls an armature lever 105, which in turn isengaged bya spring-pressed latch arm 106 carried by one end of a pivoted lever107. To the same arm of the lever 107 which carries the latch arm, the"balanced valve 54 *is connectedby means of a rod 108 and with this samearm of lever 107, the core of a solenoid 109 is'connected. This solenoidis'included in a normally open electric circuit 110, which also includescontacts 111 adapted to be bridged by a head 112 on the armature lever105,' while said armature is actuated'by the magnet 101, so that whenthe lever 107 is released by the operation of the magnet 101, thedescent of the end thereof to which the valve 54 is connected, will beinsured by the action of the solenoid 109. The core of a solenoid 113 isconnected with the other arm of the lever 107 and one terminal of thecoil of this solenoid is connected, by a conductor 114 with one pole ofthe battery 103, while the other terminal of-sa'id solenoid isconnected, by a conductor 115 with the contact 98 of the thermometer.Thus it Will be seen that when the hand 99 of the thermometer engagesthe contact 98, a circuit willbe established from battery 103, byconductor 104 to the thermometer hand 99, to contact 98, by conductor115 to solenoid 113 and then' by conductor 114, back to the battery. Thecurrent in this circuit serves to energize the solenoid 113 and causesthe latter to tilt the lever 107 and raise the valve 54.

The refrigerating coil 24 may be employed to cool brine in a tank 116 asshown in Fig. 2. The brine in this tank is circulated through a coolingcoil 24 by the operation of a pump 117 actuated'by an electric motor118. One end of said coil is connected with the brine tank by means of apipe 119, and the other end is connected, by a pipe 120 with the pump117, the latter being connected by a pipe 121 with the brine tank.

A lever 122, pivotally mounted between its ends, carries near one end, across bar 123 and from respective ends of said cross bar,

plungers 124 are suspended. The plungers are adapted to enter mercurycups 125 to form mercury circuit closers. A leading-in wire 126 from anysuitable source of electrical supply, is connected by a conductor 127with one of the mercury cups 125, and the other mercury cup 125 isconnected by a conductor 128 with one terminal of the motor 118, theother terminal of said motor'being connected by a conductor 129 with theleading-in wire 130. It is apparent that when the lever 122 is operatedto dip the plungers 124into the mercury in the cups 125,-the circuitofthe motor 118 will be closed so as to cause the operation-of thebrine-circulating pump 1-17.' "The lever 122 minal of one of said'coils' is connected by a conductor 134 with a contact 135-on a dialthermometer 136,'the latter being located in proximity to therefrigerating coil 24. One terminal of the other solenoid is connectedby conductor *'140 with a battery 141. The-contact 135 may be designatedas 30", and another contact 137 on said thermometer may be designated-36. The contact 137 is connected bya conductor 138 with one terminal ofan electromagnet 139, while the other terminal of this ma net isconnected by a conductor 140, with one pole of a battery 141,the otherpole of said battery being connected, 'by a conductor 142, with the hand143 of the thermometer 136.-

The magnet 139 controls a pivoted armature lever 144 which, intu-rn,

engages a spring-pressed latch arm carried by the lever 122, so .as tonormally'retain said lever in position to'ho'ld the plungers 124 outoft-he mercury in-the cups 125 and thus keep the circuit of motor 118open. It is apparent that when the band 143 .of the thermometer "136engages the contact 137, an electric circuit including 'the ma net139and battery 141;- that the armature lever 144 will be actuated bysaid magnet to release the latch air-m 145 and the heavier end of thelever122,causing:the closing or the motor circuit at the mercury circuitclosers and the starting of the motor 118 to operate the pump 117. Whenthe hand of the thermometer l36-engages to contact 135, the circuit ofthe solenoids 132 will be closed and the lever 122 operated to raise theplungers of the mercury circuit and open the circuit of motor 118, thusstopping the pump 117 When, during the operation of the system, thepressure in the receiver reaches such a point that no cooling effect isob tained, as for example when 40 pressure is attained in said receiverand indicated on the gage 66,the hand 67 of this gage will cooperatewith the contact '65 and close the circuit of the magnet 61,'thus'releasing the lever 44 and closing the circuit of motor 2, at themercury circuit-closers 76 78. In this manner the gas compressor 1 willbe automatically started. Whenthe arm 46 of the lever 44 descends toeffect the starting of the compressor, the balanced valves 48-49 will beopened so as to permit the How of water through pipe 11 to the condenser 91 O, and the opening of the valve 49 admitting water to the pipe53, and through the pipe 38 to apply pressure upon the diaphragm 38 soas to close valve 36 which controls the passage of water through thepipe 33 to the cylinder 35. The water pressure now in the pipe 53 willalso enter the valve chamber 30 and, operating on't-he under side of thediaphragm thereon, will cause the valve 29 to open and enable the gascompressor to relieve the pressure in the receiver 26 until the pressurereaches zero on the back pressure gage 66. Water will also pass throughthe pipe 58 and enter the casing of valve 27 under the diaphragm 27' inthe chamber 27 of said valve casing, thus opening the valve 27 andpermitting re moval of gas from the expansion or refrigerating coil.

Any desired pressure may be maintained in the cooling coils by adjustingthe contact on'the gage 66 to the desired pressure where the mostcooling effect is obtained, and also by adjusting the spring of thevalve 27, so that all pressure in excess of that where the best coolingeffect is ob tained will be released into the receiver 26. Should it bedesired to cut out the automatic pressure operated means of the valve 27the stop ,valve58" will be closed. When the head of this gage reacheszero,at this time engagin the contact 69,the circuit of the solenoids71--72 will be closed and said solenoids caused to tilt the lever 44 andthus open the circuit of motor 2, to cause the stopping of thecompressor.

Should the suppl of water to the com denser become insu cient to effectproper condensation of the ammonia gas, or should the pressure onthecompression side of the apparatus tend to reach an unsafe degree, whichwould be indicated on the gage 88, at say 200,the engagement of the hand90 of this gage with the contact 89, will close the circuit includingthe battery 92 and solenoids 71-72 and thus cause operation of the lever44 to open the circuit of the motor 2 and stop the compressor, when thecircuit of the battery 92 is closed as and for the purpose abovedescribed, the alarm 95 will be sounded.

For the purpose of controlling the operation of the expansion valve '22,according to the temperature attained in'the box or compartment wherethe refrigerating coil 24 is located, the devices controlled by the dialthermometer 96 are employed. When the hand or indicator 99 of thisthermometer reaches the contact 97, indicating, say 30, the circuit ofthe magnet 101 will be closed, thus causing the lever 107 to be releasedand made to descend in a manner to operate the balanced valve 54 topermit the passage of water from the supply pipe 53 to the pipe 56 andfinally to the chamber 23 over the diaphragm therein, and thus operateto close the expansion valve 22.

When the temperature adjacent to the refrigerating coil 24 reaches, say36, the hand 99 of the thermometer engaging the contact 98, will closethe circuit of solenoid 113 and thus cause the lever 107 to be operatedin a manner to shift the balanced valve 54 and close the supply of waterto the cham ber 23 over the expansion valve and at the same time openingthe exhaust for the escape of water in thechamber of said valve 54through the exhaust pipe 55, and permitting the expansion valve to open.

The circulation of brine from the refrigerating coil is controlled bythe dial thermometer 136. Thus when the temperature adjacent to therefrigerating coil 24 reaches a certain high temperature, say 36, sothat the hand 143 will engage the contact 137, the circuit of the magnet139 will be closed, so as to cause said magnet to release the lever 122and permit the latter to tilt and close the circuit of the pump motor,thus starting the motor. When the hand 143 of the thermometer indicates30 and engages the contact 135, the circuit of the solenoids 131-432will be closed, and the solenoids will then operate to tilt the lever122 in a manner to open the motor circuit, at the mercury circuitclosers 124-125, and thus cause the operation of the brine cir culatingpump 117 to be stopped.

In the event that the system be installed, Where water pressure is notaccessible, I may use air pressure from a suitable tank which latter maybe supplied by a suitable pump operated by the motor, and the waternecessary for the condenser and for cooling jackets may be supplied byanother pump operated by the motor, all as disclosed in my previousapplication hereinbefore referred to.

Various slight changesmight be made in the details of construction of myinvention without departing from the spirit thereof or limiting itsscope and hence I do not wish to confine myself to the precise detailsherein set forth.

Havinc fully described my invention what I c aim as new and desire tosecure by Letters-Patent, is

1. The combination in a refrigerating system, of a gage communicatingwith the expansion side of the system, electrically controlled meanscontrolled 'by said gage for automatically controllin the flow ofcooling medium from the big pressure side to the expansion side of thesystem and from the expansion to the high pressure side of the system, agage communicating with the high pressure side of the system, andelectrically operated means controlled by said last-mentioned gage andadapted to control said first mentioned controlling means to stop theoperation of the system when a predetermined high pressure is reached inthe high pressure side of the system.

2. In a refrigerating system, the combination with a compressor, anelectric motor therefor, a condensing coil communicating with thecompressor, a refrigerating. coil communicating with the condensingcoil, and return means between the refrigerating coil and thecompressor, and a valve in said return means, of a gage communicatingwith said return means, and electrically con trolled controlling meanscontrolled by said gage for automatically starting and stopping thecompressor motor and for open ing and closing the valve in said returnmeans.

In a refrigerating system, the combination with a gas compressor, anelectric motor therefor, a'condensing coil communicating with thecompressor, a refrigerating coil communicating with the condensing coil,a receiver communicating with the refrigerating coil, a return pipeconnecting said receiver with the compressor, of a gage communicatingwith said receiver, electrically controlled controlling means controlledby said gage for automatically starting and stopping the compressormotor and for opening and closing the valve in saidreturn pipe.

4. In a refrigerating system, the combination with a gas compressor, anelectric motor therefor, a condensing coil communicating with saidcompressor, a refrigerating, coil communicating with the condensingcoil, a receiver communicating with the refrigerating coil, a returnpipe connecting saidieceiver with the compressor, and a valve in saidreturn pipe, of a gage communicating. with the receiver, fluid pressuremeans. for controlling the valve in the return pipe, a valve forcontrolling said fluid pressure" means, and electrically controlleddevices controlled by said gage for automatically operating thefluidpressure controlling valve and the circuit of the compressor motor.

5. In a refrigerating system, the combination with a gas compressor, anelectric motor therefor, a condensing coil communicatin with thecompressor, a refrigerating coi communicating with the condensing coil,an expansion valve between the expansion and refrigerating coils, fluidpressure means for operating said expansion valve, a receivercommunicating with the refrigerating coil, a return pipe between thereceiver and compressor and fluid pressure means for said last-mentionedvalve, of a gage communicating with said receiver, electric-allycontrolled means controlled by said gage, a fluidpressure controlling,valve= connected with saidelectrically controlled means for controllingthe operation of the valve in the return pipe, circuit closers for themotor circuit controlled by said electrically controlled means, athermal circuit closer adjacent to the refrigerating coil, electricallycontrolled means controlled by said thermal circuit closer, and a valvefor controlling fluid pressure for operating the expansion valve,connected with said lastmentioned electrically-controlled means.

- 6. In a refrigerating system, the combination with a gas compressor,an electric motor therefor, alining storage and compression cylinders,connected piston in said cylinders, a condenser connected between saidcompressor and storage cylinder, a refrigcrating coil connected with thestorage cylinder, a fluid pressure operated expansion valve between thestorage cylinder and refrigerating coil, a receiver communicating withthe refrigerating. coil, :1. return pipe connecting said: receiver with:the compressor, and a fluidp'ressure operated: valve in said returnpipe, 21; fluid-pressure pipe communicating with the-compressioncylinder, and a fluid pressure operated valve in said pipe, of .a valvefor controlling fluid pressure tosaidzfluid-pressure ratedvalves insaidreturn pipeand flui pressure pipe, a gage connected-with the receiver,elec-. trical-l confirolledjineans controlled by said gage or operatingsaid-fluid pressure controlling valve, means operatedby saidelectrically controlled. means for controlling the operation of thecompressor motor, a thermal. circuit closer, electrically controlled,means controlled by said circuit closer, and. a-valve connected: withsaid last-mentioned electrically controlled means forcontrol'ling theoperation. of the, expansion valve.

'1. Ina refrigerating system, the combinationiwithan ammoniacompressor,an electric motor therefor, a cond ensinc coilconnectedwith. thecompressor, a refrigerating coil connectedwith the condenser, a receiverconnected with the. refrigerating coil, a return pipe; connecting thereceiver with the compressor, and a fluid pressure operated valve in.said return pipe, of a pipe for supplying fluid pressure for operatingsaid valve, a valve for controlling fluidpressure through said pipe, apivoted lever connected with said controlling valve, a gage connected.with said receiver, electrically controlled devices controlled by saidgage for controlling the operation of said lever, a motor circuit, andcircuit closing means in: said circuit and controlled by the movementsof said lever.

8. In a refrigerating system, the combination with a refrigerating coil,a brine tank containing the same, a second refrigerating coil, a pi econnecting one end of said second coil wit the brine tank, a pumpconnected with the other end of said second refrigerating coil, and apipe connection between said pump and the brine tank, of an electricmotor for said pump, a thermal circuit closer, and electricallycontrolled means controlled by said thermal circuit closer forcontrolling the operation of said motor.

9. In a refrigerating system, the combination with a gas compressor, anelectric motor therefor, a condensing coil communicating with saidcompressor, a refrigerating coil communicating with the condensing c011,a receiver communicating with the refrigerating coil, 21 "alve betweenthe refrigcrating c011 and the receiver, and a return pipe connectingsaid receiver with the compressor, of a gage communicating with thereceiver, fluid pressure means for controllin the valve between therefrigerating coil an the receiver, a valve for controlling said fluidpressure means, and electrically controlled devices controlled by saidgage for automatically operating the fluid-pressure controlling valveand the circuit of the compressor motor.

In testimony whereof, I have signed this specification in the presenceof two subscribing witnesses.

EUGENE P. CONNELLY.

-Witnesses:

WALTER E. FRENCH, MARGARET G. FANNING.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

